![]() Intrinsic and extrinsic incubation period 1 Intrinsic and extrinsic incubation period.People with HIV in this stage may be infectious. HIV may at first have no symptoms and show no signs of AIDS, despite HIV replicating in the lymphatic system and rapidly accumulating a large viral load. This is in contrast to viral latency, a form of dormancy in which the virus does not replicate. With respect to viral infections, in incubation the virus is replicating. Depending on the disease, the person may or may not be contagious during the incubation period.ĭuring latency, an infection is subclinical. A person may carry disease, such as Streptococcus in the throat, without exhibiting any symptoms. Which period is shorter depends on the disease. While latent or latency period may be synonymous, a distinction is sometimes made whereby the latent period is defined as the time from infection to infectiousness. ![]() In a typical infectious disease, the incubation period signifies the period taken by the multiplying organism to reach a threshold necessary to produce symptoms in the host. Incubation period (also known as the latent period or latency period) is the time elapsed between exposure to a pathogenic organism, a chemical, or radiation, and when symptoms and signs are first apparent. Such infection is called subclinical infection. After the latency period (but prior to clinical infection) the infected person can transmit the disease without signs of any symptoms. In some diseases, as depicted in this diagram, the latency period is shorter than the incubation period. ![]()
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